Your Superannuation is not normally included in your Will.
This is because the proceeds on your death are managed directly by the Trustees of your Super fund.
The rules of some Superannuation Funds give its Trustees complete discretion over who will receive the benefits on your death. Normally it is your spouse first then your children. This is done completely without reference to your Will.
However, most Super Funds allow you to choose the beneficiaries through what is called a Binding Death Benefit Nomination or BDBN. This is a legal document provided by the Trust. It must be signed by you in front of two independent witnesses. Neither of whom can be beneficiaries of the proceeds.
Beware: Some of these are only valid for one year and maybe invalid after three.
It is very important you discuss your options directly with your Superannuation fund.